/*******************************************************************************
 * Copyright (c) 2001, 2014 IBM Corp. and others
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following
 * Secondary Licenses when the conditions for such availability set
 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
 * General Public License, version 2 with the GNU Classpath
 * Exception [1] and GNU General Public License, version 2 with the
 * OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 *******************************************************************************/
package com.ibm.j9ddr.corereaders.debugger;

import java.io.IOException;

import javax.imageio.stream.ImageInputStreamImpl;

import com.ibm.j9ddr.corereaders.memory.MemoryFault;

public class JniImageInputStream extends ImageInputStreamImpl {
	
	private final JniMemory memory;

	public JniImageInputStream(JniMemory memory) {
		this.memory = memory;		
	}

	@Override
	public int read() throws IOException {
		try {
			byte readAddress = memory.getByteAt(streamPos);
			streamPos++;
			return readAddress; 
		} catch (MemoryFault e) {
			throw new IOException(e.getMessage() + ":" + e.getAddress());
		}
	}

	@Override
	public int read(byte[] b, int off, int len) throws IOException {
		try {
			return memory.getBytesAt(streamPos, b, off, len);
		} catch (MemoryFault e) {
			throw new IOException(e.getMessage() + ":" + e.getAddress());
		}		
	}	
}
